You will need proof that you have purchased the game. Right click Sims 3 in Library and select View CD key. (BTW you can click on their Steam profile to see that they do indeed own The Sims 3.) Right click Sims 3 in Library and select View CD key. In case it matters to anyone, these codes cannot be seen in mac OS. The keys are product codes that can be registered in Origin the same way disc codes can these codes can be found in your Steam game library: If you click on 'CD key' (shown in red), a popup appears with the codes. What are Steam keys and where can I find them?
'To play Sims 4 Game, you must first activate it on your EA account' Activate Game by using a product code Where can I find the origin codes for Steam games? Click Sims 4 inside steam under library, launches, open origin, and keep getting that same issue.
